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wipefs: don't do step-back if <type> does not match 

Signed-off-by: Karel Zak <kzak@redhat.com>
This commit is contained in:
Karel Zak 2017-06-16 11:36:41 +02:00
parent 92296e9ba2
commit 193d6f27fb
1 changed files with 14 additions and 5 deletions
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19
misc-utils/wipefs.c
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@ -171,13 +171,16 @@ clone_offset(struct wipe_desc *wp0)
}
static struct wipe_desc *
get_desc_for_probe(struct wipe_desc *wp, blkid_probe pr)
get_desc_for_probe(struct wipe_desc *wp, blkid_probe pr, int *found)
{
const char *off, *type, *mag, *p, *usage = NULL;
size_t len;
loff_t offset;
int rc, ispt = 0;
if (found)
*found = 0;
/* superblocks */
if (blkid_probe_lookup_value(pr, "TYPE", &type, NULL) == 0) {
rc = blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &off, NULL);
@ -224,6 +227,8 @@ get_desc_for_probe(struct wipe_desc *wp, blkid_probe pr)
if (blkid_probe_lookup_value(pr, "UUID", &p, NULL) == 0)
wp->uuid = xstrdup(p);
if (found)
*found = 1;
return wp;
}
@ -278,13 +283,17 @@ read_offsets(struct wipe_desc *wp, const char *devname)
return NULL;
while (blkid_do_probe(pr) == 0) {
wp = get_desc_for_probe(wp, pr);
int found = 0;
wp = get_desc_for_probe(wp, pr, &found);
if (!wp)
break;
/* hide last detected signature and scan again */
blkid_probe_hide_range(pr, wp->offset, wp->len);
blkid_probe_step_back(pr);
if (found) {
blkid_probe_hide_range(pr, wp->offset, wp->len);
blkid_probe_step_back(pr);
}
}
blkid_free_probe(pr);
@ -394,7 +403,7 @@ do_wipe(struct wipe_desc *wp, const char *devname, int flags)
wp0 = clone_offset(wp);
while (blkid_do_probe(pr) == 0) {
wp = get_desc_for_probe(wp, pr);
wp = get_desc_for_probe(wp, pr, NULL);
if (!wp)
break;